使用 NSNumberFormatter 在货币符号和值之间填充空格

发布于 2024-08-23 10:43:35 字数 290 浏览 9 评论 0原文

如果这是一个愚蠢的问题，我深表歉意，但我正在尝试为我的 iPhone 应用程序格式化货币值，并且正在努力左对齐货币符号，但右对齐该值。因此，“$123.45”的格式为（例如）

$   123.45

depending on format-width. This is a kind of accounting format (I think).

我已经尝试了 NSNumberFormatter 的各种方法，但无法得到我需要的。

谁能建议如何做到这一点？

谢谢菲托

原文

Apologies if this is a dumb question but I'm trying to format a currency value for my iphone app and am struggling to left-justify the currency symbol, but right-justify the value. So, "$123.45" is formatted as (say)

$   123.45

depending on format-width. This is a kind of accounting format (I think).

I've tried various methods with NSNumberFormatter but can't get what I need.

Can anyone advise on how to do this?

Thanks

Fitto

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月竹挽风 2024-08-30 10:43:35

您正在寻找 NSNumberFormatter 的 paddingPosition 属性。您需要将其设置为 NSNumberFormatterPadAfterPrefix 以获得所需的格式。

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两个我 2024-08-30 10:43:35

这对我不起作用。通过这样做，我可以在货币符号和金额之间添加空格。

Swift 3.0

currencyFormatter.negativePrefix = "\(currencyFormatter.negativePrefix!) "
currencyFormatter.positivePrefix = "\(currencyFormatter.positivePrefix!) "

完整代码：

extension Int {
    func amountStringInCurrency(currencyCode: String) -> (str: String, nr: Double) {
        let currencyFormatter = NumberFormatter()
        currencyFormatter.usesGroupingSeparator = true
        currencyFormatter.numberStyle = .currency
        currencyFormatter.currencyCode = currencyCode
        currencyFormatter.negativePrefix = "\(currencyFormatter.negativePrefix!) "
        currencyFormatter.positivePrefix = "\(currencyFormatter.positivePrefix!) "

        let nrOfDigits = currencyFormatter.maximumFractionDigits
        let number: Double = Double(self)/pow(10, Double(nrOfDigits))
        return (currencyFormatter.string(from: NSNumber(value: number))!, number)
    }
}

此扩展位于以 MinorUnits 表示金额的 Int 上。即美元用2位数字表示，而日元则不用数字表示。这就是此扩展将返回的内容：

let amountInMinorUnits: Int = 1234
amountInMinorUnits.amountStringInCurrency(currencyCode: "USD").str // $ 12.34
amountInMinorUnits.amountStringInCurrency(currencyCode: "JPY").str // JP¥ 1,234

千位和小数分隔符由用户区域设置确定。

This didn't work for me. I was able to add a space between the currency symbol and the amount by doing this.

Swift 3.0

currencyFormatter.negativePrefix = "\(currencyFormatter.negativePrefix!) "
currencyFormatter.positivePrefix = "\(currencyFormatter.positivePrefix!) "

Complete code:

extension Int {
    func amountStringInCurrency(currencyCode: String) -> (str: String, nr: Double) {
        let currencyFormatter = NumberFormatter()
        currencyFormatter.usesGroupingSeparator = true
        currencyFormatter.numberStyle = .currency
        currencyFormatter.currencyCode = currencyCode
        currencyFormatter.negativePrefix = "\(currencyFormatter.negativePrefix!) "
        currencyFormatter.positivePrefix = "\(currencyFormatter.positivePrefix!) "

        let nrOfDigits = currencyFormatter.maximumFractionDigits
        let number: Double = Double(self)/pow(10, Double(nrOfDigits))
        return (currencyFormatter.string(from: NSNumber(value: number))!, number)
    }
}

This extension is on an Int that expresses the amount in MinorUnits. I.e. USD is expressed with 2 digits, while japanese yen is expressed without digits. So this is what this extension would return:

let amountInMinorUnits: Int = 1234
amountInMinorUnits.amountStringInCurrency(currencyCode: "USD").str // $ 12.34
amountInMinorUnits.amountStringInCurrency(currencyCode: "JPY").str // JP¥ 1,234

The thousand and decimal separator are determined by the users locale.

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